826 EXPERIMENT STATION RECORD. 



composition of the feeding stuff's used aud of the milk produced, are 

 tabulated. 



The following conclusions are drawn: 



"(1) Wheat meal pound for pouud furnislies more food than corn meal, noticeably 

 more digestible protein. 



" (2) When wheat can be bought at about the same price as corn it is a more eco- 

 nomical grain to buy. 



"(3) It is more valuable than corn to feed with hay or such grains as barley aud 

 oats because richer in x>rotein. 



"(4) When fed to milch cows in the proportions given in this experiment, it pro- 

 duced as much milk and greater gain in llesli. It is very noticeable that the [wheat- 

 meal] rations fed in periods 1 and 3 were more efficient than [the corn meal] fed in 

 period 2. AVhile there was a very gradual and uniform shrinkage in nulk solids 

 through all the periods, due to the advance in time of lactation, the fact that the 

 cows all lost weight in period 2 and gained again, with the exception of No. 4, in 

 period .3, furnishes good grounds for the above statement." 



Silaf/e composed of mature J1 hit vorn^ sHufJower heads, and peas as food 

 for milch cows (pp. 30-35). — The silage was the Eobertsou mixture, 

 except that black-eyed peas were substituted for the horse beans. 

 This was tested with 5 cows in 5 periods of 14 days each, feeding it in 

 connection with hay and as a partial or total substitute for a grain 

 ration of corn meal, cotton-seed meal, and bran. From 30 to 50 lbs. of 

 silage was fed per head daily. The data, including the composition of 

 the feeding stuffs and of the milk, are tabulated. From these data the 

 results are summarized as follows: 



"(1) The materials composing the silage used can be perfectly preserved and suc- 

 cessfully kept in the silo as late as June of the following year. 



"(2) The pea, sunflower, and corn mixture produces a silage somewhat richer in 

 protein than corn alone and is very greedily eaten by stock. 



"(3) To attempt to substitute this mixture entirely for the grain ration was not a 

 success, the coavs shrinking quite materially in their flow of milk without an 

 increase in its richness. The shrinkage was undoubtedly due to a lack of digestible 

 protein ; the total and digestilde organic matter consumed was practically the same 

 but the protein was considerably less than in period 1. On returning to the grain 

 and silage ration in period 3 the flow of milk was increased to nearly the original 

 yield. 



" (4) In period 4 silage was substituted for one-half the grain ration, 20 lbs. silage 

 for 3 lbs. grain, with good results. All the cows increased in weight and shrank 

 no more in milk than would be expected from the advance in time of lactation, the 

 solids and fat increasing slightly." 



On the variation in the number and size of fat globules in milk, 

 M. E. McDonnell and J. W. Fields Pennsylcatda Sta. Bpt. lS95,pp. 

 75-85). — The observations here reported were made in connection with 

 the experiments on the effect of quantity of food and of nutritive ratio 

 upon milk production, reported above (p. 823). In the experiment on 

 the effect of nutritive ratio the observations were confiued to one cow, 

 and the results are given for periods of (! days throughout the trial 

 and are shown graphically. Comi^arisonsAvere made of the size of the 

 globules when the cow was on different rations, temporarily ill, and 

 under other varying conditions. 



